Organic phosphorus compounds



Patented Sept. 9, 1952 UNITED STA ES PA ENT r a a q oRGANIoPHosPHonus COMPOUNDS William T. Dye, 'Jr., Dayton, Ohio, assignor to Monsanto Chemical Company, St. Louis, Mo., a

I corporation of Delaware No Drawing. Application May 18, 1950,

3 Serial No. 162,823

The present invention relates to new organic phosphorus compounds. and dealsmore particularly with new polyamido polyphosphates and to a method of preparing the same.

An object of the invention is to provide new and useful organic compounds of phosphorus. Another objectof the invention is to provide a new class of highly efficient insecticides. Still another object is the provision of an easymethod for the preparation of the new organic phosphorus compounds in good yields.

These and other objects which will be hereinafter disclosed are provided by the following invention wherein pentakis di N substituted amido triphosphates are obtained by. reaction of a bis(di-N-substituted amido) halophosphate with a diester of a di-N-substituted amidophosphoric acid substantially according to thescheme:

Claims. (01. 167-22) methylami-do) triphosphate, pentakis(diethylamido) triphosphate, pentakis (diphenylamido) triphosphate, pentakis (dicyclohexylamido) triphosphate, tetrakis (dimethylamido) diethylamidotriphosphate, pentakis(di-n-butylaLmido) triphosphate, pentakis(di-n-hexylamido) triphosphate,

etc. Examples of bis(di-N-substituted amide)- halophosphates employed for the preparation of the present triphosphates include bis(dimethylamido)chlorophosphate, bis(diisopropylamido) bromophosphate, bis (diethylamido) iodophosphate, bis (diisobutylamido) chlorophosphate,

bis(dicyclohexylamido) chlorophosphate, bis(di reactants, the'condensation of the bis(di-N-substituted amidmhalophosphate with the diester" of a di-N s ubstituted amidophosphoric acid to yield the present pentakis(di-N-substituted amido triphosphate may occur under varying conditions of temperature andpressure. While some of the desired product is formed by simply contacting the bis(di-N-substituted amidolhalophosphate with the diester of a di-Nfsubstitut'ed amidophosphoric acid in any proportion, for optimum yields it is advantageous to employ stop chiometric quantities ofthe reactants, i. e.', at

least two moles of the halophosphate per mole f of the diester, and to maintain the mixture of the two reactants at elevated temperatures, i. e.,

at temperatures of from, say, C. to 250 C. and

preferably C. to C. until the formation 1 of the desired triphosphate is completed. Since the reaction is accompanied by evolution of a In order'to minimize formation of by-products and decomposition of the triphosphate, it is advantageous to discontinue heating as soon as evolution of hydrocarbon halide has ceased.

Because the condensation occurs very readily, a

heating time of only a few minutes to an hour is generally sufficient. When evolution of hydrocarbon halide has ceased, the triphosphate may be separated from thereaction mixture by distillation or by fractional crystallization. If distil lation is employed in the separation, it should be eiiected as rapidly as possible since lengthy heatingis detrimental; f

The condensation of the bis(di-N-substituted amido)halophosphate with a diester of the di- N- substituted amidophosphoric acid may be efiecte'd in the presence or absence. of an extraneous solvent or diluent. While the use of a diluent is sometimes advantageous; particularly when working with large quantities of reactants, such' a practice generally requires longer heating time,

both during the condensation step and in the separation procedure.

When operating in the absence of a solvent or diluent, and employing stoichiometric quantities eously employed as contact and/or systemic] pesticides and are particularly valuable as syse teniieinsecticides." Application of small amounts:

3 of the present triphosphates to plants which are to be protected from insect pests results in absorption of the triphosphate by the plant, whereby the entire plant system is rendered pestproof. The present triphosphates may be applied to plantsrasv dusts or. sprays. They may be ad.-

mixed withtalc; b'entonite. or otherinert powders;

or dusts in concentrations of, say, from 0.5 per cent to per cent and dusted on herbage, grasses;. trees, etc., or they may be employed in aqueous and organic water emulsions and-'solutions' indihe concentrations and sprayed. on the organisms.

which are to be protected.

The invention is further illustrated, but' not limited, by the following examples:

Example 1 A mixture consisting of 34.1 g. (0.2 mole); of bis (dimethylamido)chlorophosphate and 18.1 g. (0.1 mole) of. diethyl dimethylamidophosphate. wasi'heatediunder 'refiuxto. atemperature of 180? CL within a time of 1 0 minutes. periodit was notedthat gas evolution. (ethyl ch10. ride)? began at a temperature of;1' 20f G. andbecame very vigorous at about 170 Cl,.but-bythe time the. temperature.reached-180 C. evolution. of'th'e ethylchloride wasvery muchslowen- The. temperature was thenbrought to 200 C. and.

allowed to remain. at this. point for about.

minutes. The t'otalLheatingt'ime was. Iminutes.

The reaction miicture was allowed to cool and? then. fractionated to give 26 g; of the substanetially pure pent'akislmimethylamido)triphosphate,B. Pl; 190 1:0 200 (L/05 mm. of. mercury-n and analyzing; 17.59; per. cent.- nitrogen. (calculated. for. nitrogen, 1731 per cent) EZca' mpZe Z" 0.3- mole (512 g.) of bis.(dimethylamidoichlorophosphate. andibil'. mole. 18.1".g.). ofidiethyl diinethylamidophosphate werei'ni'xedinra. 100 cc. flask andlheatedw-ith a mantletoatemperature o'f'16'0' G1,. at which point vigorous evolutiorrof.

Duringv this.

ethyl chloridebegan. Ekternal heating wasthen discontinued, but. the temperature of. the reaction mixture rose. to. 195 Cl. within. 2 minutes.

and remained. at this point. for an additional 5. minutes. V slower,v the temperature fell to 185 Ci',..and the mantle was removed. The reaction mixture was then rapidlycooled, transferred to. a. distilling. flask fitted. with an- 8" inch Vi'greux. column,. and

Evolution of' ethyl chloride became distilled to give 21g. (53 per cent yield) of sub I stantially pure pentakis dimethylamidoltri phosphate, 13. P.18'0 to 190 (ll/0141mm. of mencuryJne z-reeeo;

Example 3 example shows the. use: of a diluent and. longer reaction. time: in. the. preparation of.

pentakis(dimethylamido).triphosphate. A. mix

ture: consisting of 36.2 g. (0.2 mole) of: diethyldiinethylamidophosphate, 76.6. g.- (0.451 mole of.

bis-(dimeth ylamido )chlorophosphate and oflxylene. was. refluxed. for a: time of: 18- hours. Separation oisome solids which formed upom cooling, and: distillation of. the filtrate gave. 22 g;-

of crude pentakis.(-dimethylamido).triphosphate, 3 121970 to C./0-.4.mm. of mercury-.-

Freparation. of other pentakis(di. --N-substituted.

amido)triphosphates in which the substituent -is a hydrocarbon. radical of from. 1. to 6 carbonatoms may be similarly effected; the bi's('dlme'thylamidb)chlorophosph'ate of" the above examples being replaced by other bis tit-substituted reaction. and? permit; the use of lower temperatures.

What? I claim is:

' 1". As new compounds, pentakis(di-N-substituted. amido)triphosphates having the general formula 2 As new' compound, pentaki'sl'dimethyliarnido)Itriphosphate.

3". An. insecticidal composition. comprising. an. inert carrier and. as the essential. active ingredient in a quantity; which is toxic to insects. a pentakis.(di-N-s'uhs-titut'edi ami'doltriphosph'ate having. the general" formula in which R. is a-.-hydrocarbonresidue ofi from 1- to 6 carbon atoms.

4. An insecticidal composition comprising an inert carrier and pentakisidimethylamido)tri phosphate, as an essential active ingredient, said triphosphate being present in a quantity which is" toxic to insects;

5. The method for the preparation of pentakis- (dieN-substituted amido)triphosph'ates. having, the general formula It ll; (HEN)? O---OPL-('NRQ)Q Riin which R-is a hydrocarbon residue of fro'm L. to d carbon 'atoms. which comprises. heating. a; halophosphate having the: generalformula.

in whichiRI is; a. hydrocarbonv residue ortrram. l;

to 6" carbon. atoms and. Xis fiamgem. with aidil ester ofan amidophosphoric.acid havingthe-gen-e e'raI formula.

(R5)= 2PONR2.-.

in" which a; hydrocarbon residhe=- of from" 1: to 6 carbon atoms and: R" is member" of the group-consisting of al yl; cycloall iyland aralhyl radicals of from 1 to 2" carbon atoms.

Them'ethod for thepreparation' ofpentahis- (dimethylfamido) triphosphate which epmpneee heatingBisrdimethylamidoi chlorophcsphatewitfi a diester' of dim'ethyl'a-midophosphori'cacid 'h av 'ing the general formula ("ROJJQPGN (0113112;

in which R; is a member ofthe group consisting; of. alkyl, cycloalkyl andi aralkyl mama-cerium ltolz'carbonatoms;

in which R is a hydrocarbon residue of from 1 to 6 carbon atoms and X is halogen with a molar equivalent of a diester of a di-N-substituted amidophosphoric acid having the general formula in which R is a hydrocarbon residue of from 1 to 6 carbon atoms and R is a member of the group consisting of alkyl, cycloalkyl and aralkyl radicals of from 1 to 12 carbon atoms and recovering from the resulting reaction product a pentakis di N substituted amido) triphosphate having the general formula in which R is a hydrocarbon residue of from 1 to 6 carbon atoms.

6 9. The method which comprises heating at least two molar equivalents of bis(dimethy1- amido)chlorophosphate with a molar equivalent of a diester of dimethylamidophosphoric acid having the general formula (R0) 2PON(CH3) 2 in which R is a member of the group consisting of alkyl, cycloalkyl and aralkyl radicals of from 1 to 12 carbon atoms and recovering pentakis- (dimethylamido)triphosphate from the reaction product.

10. The method which comprises heating at least two molar equivalents of bis(dimethylamido chlorophosphate with a molar equivalent of diethyl dimethylamidophosphate and recovering pentakisfidimethylamido)triphosphate from the reaction product.

WILLIAM T. DYE, JR.

REFERENCES CITED UNITED STATES PATENTS Name Date Kosolapoff Apr. 4, 1950 Number 

1. AS NEW COMPOUNDS, PENTAKIS(DI-N-SUBSTITUTED AMIDO)TRIPHOSPHATES HAVING THE GENERAL FORMULA 